Trip-hook sling



July 9, 1929. w F OWENS 1,720,054

' TRIP HOOK SLING Filed May 24, 1928 Wi'ZZiamFOwem Patented July 9, 1929.

UNITED STATES WILLIAM F. OWENS, OF SEATTLE, WASHINGTON.

TRIP-HOOK SLING.

Application filed May 24,

My invention relates to trip hook slin gs that are adapted for use in hoisting such materia as piles, ties, poles, lumber and numerous other objects having length. The primary ob jeots of the invention are to provide a trip hook sling comprisino two parts and means whereby the two parts may be readily disconnected by means of a trip line for depositing the load. This arrangement of discon netting the sling in its middle portion proviocs means whereby the load may be deposited in any particular spot without disturbance. In the use of my device, after the load has been deposited, the two severed parts of the sling may be readily hoisted clear of the load on either side thereof, whereas in the old method of using a one piece sling the load is invariably jumbled and thrown out of place while removing the sling and either requires considerably more overh-ad space or necessitates several successive operations in hoisting the sling clear of the load. Besides the foregoing advantages my device is adapted to automatically trip itself when the load deposited. Furthermore in my device the standing and trip portions may be used independently of the connecting portion in handling certain loads as hereinafter set forth.

ith the above and other objects in view which will appear as the description proceeds the invention consists of the novel construction, adaptation, combination and arrangement of parts hereinafter described and claimed. hese objects are accomplished by devices illustrated in the accompanying drawings; wherein:

Figure 1 is a view in perspective shoving two slings constructed in accordance with my invention and suspended from a spreader member in the operative position;

Fig. 2 is a view in elevation showing how the standing and trip portions of the device may be used in hoisting or lowering objects; and

Fig. 3 is a view partly in elevation and part- .ly in section showing the link and hook mem bers of the device in their locked position in full lines and showing the released position of said members in dotted lines.

Referring to the drawings throughout in which like reference numerals designate like parts and more particularly to Fig. 1, the numeral 5 indicates a spreader member having a chain 6 secured at both of its ends to the ends of the spreader and having a hook 7 caught 1928. Serial No. 280,184.

in the middle portion of the chain with a cable which ordinarily leads through pulley blocks to a hoisting engine. Said spreader member is provided with a hook 8 at either end for suspension of my device which will now be described.

As shown in Fig. 1 a sling made in accordance with my invention is suspended from each of the hooks 8 in position for raising or lowering long objects such as logs or the like which are ordinarily suspended in the loops of the slings will be understood. For the sake of clearness the load of logs or the like has been omitted from the drawings. It

will be understood that the slings in the looped position shown will assume a somewhat rounded or annular shape when the logs are installed therein and that the load of logs will exert considerable lateral pressure against the sling members.

Usin nautical terms in a description of one of the slings as shown in Fig. 1, a standing cable 9 has its looped end 10 placed over one of the hooks 8 and passes through a block 11 to which it is soldered or otherwise secured. The lower end portion of said standing cable passes into a hole in the end portion of a standing link 12 and is soldered or otherwise secured therein as shown at 13 in F 3. Said standing link is bifurcated by a slot 14 and a trip hook 15 is pivotally secured within said slot by means of a pin 16 passing through the bifurcated ends of the standing link and through the head portion of the trip hook.

A connecting link 17 bifurcated by a slot 18 has a pin 19 disposed across its bifurcated ends that is adapted to normally rest in the mouth of the trip hook 15 when the device is in the connected position. A connecting cable 20 is secured in the end of said connecting link at one of its ends, as at 13, and its other end is looped over the hook 8 at 21. Thus closed sling is provided comprising the cable 9, link 12, hook 15 and cable 20. However, owing to the fact that the pin 19'is olfset from the pin 16, there is nothing thus far to prevent the hook 15 from turning 011 its pivot 16 and thus releasing said pin 19 from the mouth of said hook.

As a means for restraining the trip hook 15 from turning on its pivot and also as a means for tripping the device, I have provided a trip link 22 having a slot 23 wherein the end of the body portion of the hook 15 is pivotally secured by a pin 24. A trip cable 25 has one of its ends secured in one end portion of said trip link and slidably passes through a hole 26 in the block 11 with its loop end 27 caught over the hook 8 thus completing the sling as a whole.

It will be understood that the cables 9, 20 and 25 are of such lengths as to prevent any slack and that the weight of the load will hold said cables taut while exerting considerable lateral pressure thereon and thus holding the device securely in the connected position. When the load is lowered to the ground or other, place the loops 27 of the cables 25, being made of stiff wire, will slip upwardly off of the hooks 8. N ow when the device a whole is hoisted upwardly, there being no restraint now on the trip link 22, the links 17 will be drawn outwardly carrying the trip links 22 along and turning the trip hook 15 around its pivot pin 16 until the mouth of said hook is in such position that the pin 19 will escape therefrom and the device will be disconnected as shown in dotted lines in Fig. 3.

It will be understood that the links 17 and 22 are not ordinarily more than six inches in length and the hook 15 is approximately two inches in length. The load is usually eight or ten feet across and owing to its comparatively great weight a very great moment of force is set up in the very short distance between the pins 16 and 19 when the cable 25 is released. Thisgreat moment of force is sufficient to overcome the weight of the particular part of the load that is resting on the hook 15 which will therefore be turned on its pivot :pin 16 and the pin 19 will thereby escape from the hook and thus the device will be disconnected. lVhile the link 22 and hook 15 are shown in dotted lines in Fig. 3 as movin g upwardly when the device is disconnected it will be understood that they may have a downward pivotal movement in some cases depending on the lines of least resistance.

lVhile the foregoing operation is taking place the trip cable 25 will slide downwardly through the hole 26 in the block 11 and thereby be prevented from dropping down in the way of the load. It will now be seen that the devices automatically disconnect themselves in their middle portions as they are being hoisted and the two parts of each sling will be easily drawn from under the load on either side. Thus the load may be easily and readily placed at any exact .spot desired and will not become jumbled or disa-rranged in any way when so placed.

In Fig. 2 of the drawings I have shown how the standing and trip portions of my device may be used without the connecting portion. In this instance the load is carried directly by the trip hook 15 which is prevented. from tripping as before by the trip line 25 which has its loop 27 caught on a hoisting hook 28. As the load comes to rest the loop 27 will slip upwardly off the hook and when the device is again hoisted the weight of the load pulling downwardly against the mouth of the trip hook at a point otiset from its pivotal support at 16 will cause said hook to turn about said pivotal support until it reaches a point where the load will slip from the hook as indicated in dotted lines.

In the foregoing description it will be un derstood that the loop 27 of the cable 25 must always be on the outside of the other two loops 10 and 21 which may be fixedly secured to the hook-8 it so desired. The drawings are merely intended as an illustration of the manner in which my principle may be reduced to praeticeand minor changes may be resorted to in the construction of the device without departing from the scope and spirit of the invention. While I have shown and described two ways only there are other ways in which my device may be used to equal advantage.

I claim:

1. A trip hook sling comprising a stand iug line, a standing link for said line, a trip hook pivoted to said link at a point normally offset from the mouth of the hook, a trip link pivoted to the end of the body portion of the hook, and a trip line for said trip link.

2. A trip hook sling comprising a standing line, a standing link for said line, a trip hook pivoted to said link at a point normally offset from the mouth of the hook, a trip link pivoted to the end of the body portion of the hook, a trip line for said trip link, a block secured to said standing line, and said trip line slidably disposed through a hole in said block.

3. A trip hook sling comprising a standing line, a standing link for said line, a trip hook pivoted to said link at a point normally ofiset from the moutn of the hook, a trip link pivoted to the end of the body portion of the hook, a trip line for said trip link, means for retaining said trip line in position, a connecting link normally in engagement with the trip hook, and a connecting line for the connecting link.

In witness whereof, I hereunto subscribe my name this 18th day of May A. D. 1928.

WILLIAM F. ownus. 

